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Cross-site Scripting occurrences in Activematrix Business Process Management
The workspace client, openspace client, app development client, and REST API of TIBCO Software Inc.'s TIBCO ActiveMatrix BPM, TIBCO ActiveMatrix BPM Distribution for TIBCO Silver Fabric, and TIBCO Silver Fabric Enabler for ActiveMatrix BPM contain cross site scripting (XSS) and cross-site request forgery vulnerabilities. Affected releases are TIBCO Software Inc.'s TIBCO ActiveMatrix BPM: versions up to and including 4.2.0, TIBCO ActiveMatrix BPM Distribution for TIBCO Silver Fabric: versions up to and including 4.2.0, and TIBCO Silver Fabric Enabler for ActiveMatrix BPM: versions up to and including 1.4.1. (2019-04-24, CVE-2019-11203)
Why Cross-site Scripting can be dangerous
Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.
The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:
https://server.com/confirmation?message=Transaction+Complete
what results in:
<span>Confirmation: Transaction Complete</span>
In that case the message can be modified to become a valid Javascript code, e.g.:
https://server.com/confirmation?message=<script>dangerous javascript code here</script>
and it will be executed locally by the user's browser with full access to the user's personal application/browser data:
<span>Confirmation: <script>dangerous javascript code here</script></span>